If you wish to make a montage first generate a large enough blank image with the pstar command.
implant writes the following keywords into the FITS header
NIMPLANT - the number of files that have been implanted in current image IMPLANTn - sr,sc,nr,nc (in FITs style) of the time size written
dc= specifies the displacement of the center columns of the images.
dr= specifies the displacement of the center rows of the images.
ignore - writes only the portion of the image contained in the output image. The default is to give an error message telling that it is out of bound.
trim= removes the outer number of pixels from the input image (default: 0);
feather= blends in overlaps by the specified number of pixels (default:0).